Reciprocating cutter power lawn mower



April 25, 1950 J 2,505,296

RECIPROCATING CUTTER POWER LAWN MOWER Filed Feb. 18, 1948 2 Sheets-Sheet l INVENTOR.

. JMLLEQZ f] fafl 7 M 2 n 3 m a ,46 m m 5 6 N 0 w a m w 3 s (5 N 7 M S 2 1x1 719245 J 177L522? BY M24 *M M. J. MILLER RECIPROCATING CUTTER POWER LAWN MOWER April 25, 1950 Filed Feb. 18, 1948 :brokem aways. of. embodiment: of" the :inven- Patented Apr. 25, 195C 01 FICE;

KEGIPR'O GATING -CUTTERPOWER EMOWEB;

Mathias IL Miller, Evansvillaglnd;

Application. February 18,-159@8;--SB113ENE|922I 6? .Claim& ((156-265) cutting meehanism whichis simple, efllcient and.

effective in: its operation and easily controlled by the operator-thereof;

Another objectof' the invention is the provision in a lawn mower of noveluandsefllbient means 'for' guiding blades of grass and:- the like t'owar'dthe cutting blz'tdes.

A further object of the-invention is the provision-"of novel side bu'ii'ers fora lawnmower:

A still further object' of' theinvention is-the provision of a novel arrangement of a'pair' of cooperating blades to provide eflicient and even .severingof grass and thelik e.

Still an'otherobject of the"inventionfis-thaprovision of novel and erficient' means for adlusting-"th'e' position of the cutting'blades of-"a lawn mower with respecttothe'ground:

Another" object or the invention isth'e provisionof a lawnmower which will cut grassasdistinguished from a mere; whipping of grass which takes place with'the conventional mower.

A further object of the invention is the provision of.la.mower which. willlcleanly: and evenly cutg'rassrregardless cfitsheight':

.A. further object of the 'i'nvcntion is the provision of. a mowenall of. the parts ofwhich" are designed for mass production.

Another object of the invention is. theprovision of a mower of rigid construction butliav- .ing. such simplicity that' an operator of small sliill. may remove or replace the various parts thereof. and thus assure the apparatus of an A.further. objectof theinvention is the provision; era. lawn. mower so designed as. to. leave 7 minimum wheel. marks; in a .lawn duriha normal operation vAstral-1. further object of. the invention; is. the.

. provision or 5 a lammowiar whichds. capable-of become apparentvfrom: a-reading; of. the followh1g3 speeiflcatiom takenzini conjnn'ctionlwithtthc drawings, in which:

Figure: 1. iS-"ae side" elevationah view; partly "File-urea 2v is.- a fragmentary plan view or Figure figure 35 isaa plan view of a portion of the inventirm,v Eieurek is arrelevat-ional view, partly in section', illustrating certain details- 0f construction, Figure-fidsa view similar to Figure"! but taken at-an angle thereto,-.and. Figure 6 is an exploded fragmentary perspective view illustrating certain: details ofconstruction.

Generally there is provided. a lawn.v mower having a frame to whichisattached ayokewhich w interconnects. with: an operating handle. The

lframe. is providedwith-a pair of comparatively large supporting wheels and mounts thereon a .a-Jmotor of low horsepower. which is-operatively connected with alaterally slida ble. blade to reciprocate the same. A stationary cooperating 29 bladeis mounted adjacent the movable blade and bothhiadesare provided with cutting teeth.

"Ihemower is provided with apair. of. outward- 1y extending guide arms adapted to: guide blades of grass'and the. like to the blades and a revo- 145 'lublee buffer. of. rubber positioned upon either side of the frame toprotect both-the mechanism of: themower. and: any objects with whichv the mower. mightaccidentallycome in contact.

Referring, more particularly to the drawings,

there: isshown. therein a lawnmower having. .a

frame consisting of a pair of side plates I 0 interconnected at. their. rearward. ends by a. laterally extending. brace .member II having integrally formed flanges l2.- connecting the side 35 platesabameansor bolts 13.

The forwardiends. of thesideplate I 0 are each provided withanin-tegrallyformed bracket com- .prismg. a vertical wall member. l4 and-a horizontaI-IyP and forwardly: extending shelfmember to lfi: having. upwardly and forwardly extending-.lip Hi; Iihe. Wallmembers. [4: are provided with-screw openings: H and. the. shelf members mare-provided witln screw openings. [8.

Leshaped .h'ame: member isformed. with fi farvertica'l wallz [B ande forwardly extending horizontal-wall- ZDJ-and is provided with. a: series of: openin'gafladjacent either end: of -its vertical wall 19 and a series of screw" openings \22iadjacenteeither: end oiits horizontal :wall 20. to Gap screws- (not shown), preferably of. the Allen head type, interconnect the L-shaped iname mcmber.andtheubracketsof. the. side plates through: openings. N and L1,. and- 22 and 18, respectively;

65 intermediates nameplate. can. provided position by means of a wire clip 4?.

'of a spring clip 14.

with a T-head 24 at its rearward end for affixing the same to the brace member H by means of bolts 25 and a platform 26 is aflixed upon the upper sides of the plate 23 and member I l by means of screws 21. A motor 28 is mounted in any suitable manner upon the platform 23 and is provided with a drive shaft 29 having a drive pulley 38 mounted thereon.

A roller 3| is provided with reduced portions 32 at either end from which protrude trunnions 33 which are each revolubly mounted in the lower end of an arm 34 which is provided with a pair of slots 35. Bolts 36 are threadably mounted in each of the side plates l5 and pass through the slots to adjustably position the arms 34 and thereby the position of the forward end of the framework of the mower with respect to the ground.

Adjacent the rear ends of the plates !8 in each case a stub shaft 3-! extends outwardly and has mounted thereon a wheel 38 having a rubber tire driven pulley 43 which is interconnected with the pulley 39 by means of a belt 44. In place of the belt 44 a chain, preferably of the silent type, may be utilized.

Interiorly of the housing 40 and afiixed to the shaft 42 is a helical gear 45 and access may be had to the gear 45 through a cover 45 held in A race of ball bearings 48 and a like race- 49 are provided on either side of the gear 45. A' helical gear 59 is enmeshed with the gear 45 and is mounted upon a vertically dependent shaft 5! whose lower end has aifixed thereto a cam 52. A ball race 53 and a like ball race 54 are mounted at either side of the gear 59 and access may be had to the gear 59 through a cover 55 held in position by means of a wire clip 56. Two additional ball races 5? surround the shaft 42 within the plates 23 and 4 l. The cam 52 is revolubly mounted in an elliptical shuttle member 58 which is rigidly affixed to a movable blade 59 by means of rivets 58 or the like. The blade 59 is provided with a series of V-shaped cutting teeth 6| at its forward end and a plurality of slots 62 are formed longitudinally in the blade v A stationary blade 63 lies upon the shelf member 25 and is provided with a series of cutting teeth 84 and a plurality of slots 65 which slots are relatively shorter in length than the slots 62 and are adapted to snugly receive blocks 65 therein. The blocks are provided with screw openings 81. A pair of cover plates 58 having tapered forward edges 69 are each provided with j a pair of vertically extending screw openings 18 and a longitudinally extending groove Tl upon.

their undersides. Screws 12 are adapted to pass through the openings 19 and 61 and engage openings (not shown) in the shelf member It will be understood that the blocks 58 extend through the openings 62 in the blade 59 and act as guides for the lateral reciprocatory movement of'the blade 59.

shaft 5| in position by means A'ball race i3 is provided for the the housing 49 and is held in A pair of yoke members 14 are detachably affixed to the side plates H] by means of bolts and are engaged with an elongated shank 15 by means of bolts 1! and a bolt 18 holds a handle '19 upon the outer end of the shank. An elongated link 88 interconnects a control lever 82 of the motor 28 and a. control lever 83 pivotally mounted upon a bracket 84 which is, in turn, affixed to the upper end of the shank 18, adjacent to the handle 19.

A guide arm 85 extending beyond the outer ends of the teeth 6| and 54 is affixed, by means of screws 85, to the upper forward end of each of the side plates I0 and each of the members 85 is provided with a pair of integrally formed outwardly extending ears 81 between which is revolubly mounted a buffer wheel 88 which is preferably formed of rubber or similar material.

In operation, it will be apparent that the height of the blades 59- and 53 above the ground may be regulated by loosening the bolts 35 and setting the arms 34 in adjusted positions and thereafter tightening the same whereby the roller 3| is raised or lowered as the case may be to support the forward end of the frame in higher or lower positions with respect to the ground. The motor 28 may be readily controlled by the hand lever 33 which is convenient to the hands of the operatorand thus the speed of the movable blade 59 may be controlled as the mower is manually .moved over the'ground in conventional manner.

It will be seen that the guide members 85 will gather and direct toward the teeth 5! and 54 grass which may be in the path of the mower and that the reciprocity of the blade 59 over the blade 63 will cause the teeth BI and 64 to operate in the manner of shears, that is to say they will actually out the grass which may be in the path of the mower. The buffers 88 will allow for the use of the mower in close quarters and furthermore allow the blades 59 and 63 to very closely approach an object such as a curbing, monument or the like without scarring the same and without injuring the apparatus in any manner. It will also be seen that the interior of the housing 43 may easily be provided with grease whereby to lubricate the moving parts therein and that access may be had to all of the various parts of the mower for the repair or replacement thereof. A guide 89 may be affixed to the lower end of the shank 16 by screws 98 or the like for guiding the link 80.

While but one form of the invention has been "shown and described herein, it will be readily apparent to those skilled in the art that many minor modifications may be made without departing from the spirit of the invention or the scope of the appended claims. What is claimed is: V

1. In a lawn mower having a frame, a supporting wheel at each side of the frame and a pair of transversely extending cooperating blades carried at the forward end of the frame, the provision of a guide member extending forwardly vand outwardly at either side of the frame to points immediately outwardly of the plane of the outer side of the adjacent supporting wheel. 2. In a lawn mower having a frame, a supporting wheel at each side of the frame and a pair 4 of transversely extending cooperating blades carried at the forward end of the frame, the provision of a vertically disposed fiat guide member extending forwardly and outwardly at eitherside of the frame to points immediately outwardly of 'the plane of the outer side of the adjacent supporting wheel.

3. In a lawn mower having a frame, a supporting wheel at each side of the frame and a pair of transversely extending cooperating blades carried at the forward end of the frame, the provision of a guide member extending forwardly and outwardly at either side of the frame to points immediately outwardly of the plane of the outer side of the adjacent supporting wheel and a revoluble buffer extending outwardly and horizontally from each of the guide members.

4. In a lawn mower having a frame, a supporting wheel at each side of the frame and a pair of transversely extending cooperating blades carried at the forward end of the frame, the provision of a guide member extending forwardly and outwardly at either side of the forward end of the frame to points immediately outwardly of the plane of the outerside of the adjacent supporting wheel, a pair of ears formed integrally with the outer side of each of the guide members, a wheel revolubly and horizontally mounted in each pair of ears and a resilient covering for the outer periphery of each of the wheels carried by said ears.

5. In a lawn mower having a frame, a supporting wheel at each side of the frame and a pair of transversely extending cooperating blades carried at the forward end of the the provision of a vertically disposed fiat guide member extending forwardly and outwardly at either side of the forward end of the frame to points immediately outwardly of the plane of the outer side of the adjacent supporting wheel and a revoluble buffer extending outwardly and horizontally from each of the guide members.

6. In a lawn mower having a frame, a supporting wheel at each side of the frame and a pair of transversely extending cooperating blades carried at the forward end of the frame, the provision of a vertically disposed fiat guide member extending forwardly and outwardly at either side of the forward end of the frame to points immediately outwardly of the plane of the outer of the adjacent supporting wheel, a pair of ears formed integrally with the outer side of each of the guide members, a buffer wheel revolubly and hell. tally mounted in each pair of ears and a resuent covering for the outer periphery of each of said buffer wheels.

MATHIAS J. MILLER.

CITEB The following references are of record in the of this patent:

UNITED STATES PA'IENTS Name Date 1,616,498 Duckett Dec. 14, 1926 1,724,409 Ott Aug. 13, 1929 2,106,033 Mall Jan. 18, 1938 

